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introduction： introduction Steam turbines have many large shaft classes、Plates and cylinder parts(As principal axis、rotor、impeller、septum、cylinder)Need to be turned，The turning process is divided into rough、semigrance(trundle)washi。Large margin when roughing，Turning tools need to withstand a lot of cutting resistance，It is also required that the blade can maintain sufficient strength and not produce displacement under the condition of strong cutting，And finishing is the key of parts processing，It is the guarantee of processing quality(precision、roughness、Form and position tolerance, etc)，Therefore, it is required that the spatial position of the tool blade cannot be changed during use。
2015-03-26 Reading quantity 2881
introduction：Angular contact ball bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Working reliability and longevity，Even under good working conditions，There is also some dispersion。For important equipment，Especially equipment that works under harsh conditions，Whether the angular contact ball bearing installed with it works reliably or not，How long it can keep going，All in all, its luck
2015-03-26 Reading quantity 1558
introduction：1、Function and classification of lubricants The application of paper coating lubricants dates back to the beginning of this century。At that time, the paper pigment coating adhesive was mainly animal glue or casein，The paint has a very low solid content。These adhesives have good adhesion and excellent water retention properties，But the membrane it forms is brittle，Therefore, it is necessary to add an additive that can improve the folding and bending resistance of coated paper and board。These additives also improve the fluidity and equalization of wet coatings。This is effective for both wet paint，An additive that also plays a role in dry coating，It was once seen as“plasticizer”Additive to，ready-to-use
2015-03-26 Reading quantity 1567
introduction： As shown in the figure,The speed regulating valve is a throttle valve with pressure compensation。It has a constant difference pressure reducing valve and a throttle valve in series。Throttle before、afterpressurep2andp3Lead to pressure reducing valve spool right respectively、Both left ends，On-load pressurep3magnify，Therefore, the liquid pressure acting on the left end of the pressure reducing valve core increases，Move spool to the right，Pressure opening extension，Pressure drop reduction，makep2Also increase，So that the throttle valve pressure difference（p2-p3）Remain unchanged；Vice versa。In this way, the flow rate of the speed control valve is constant（Not affected by the load）。 The speed regulating valve is the structure of reducing pressure before throttling。Can also be designed first
2015-03-26 Reading quantity 2892
introduction： A、Small bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Mounting assembly（sleeve、Plastic hand hammer） B、Hook head wrench C、Impact wrench
2015-03-26 Reading quantity 1449
introduction： Use heat-absorbing media to cool high temperature parts﹐A device to keep the internal combustion engine operating at optimum temperature。In the internal combustion engine﹐Due to cylinder liner﹑Cylinder head﹑Piston and valve and other parts are directly in contact with high temperature gas and are heated strongly﹐The machine temperature is very high。This will not only lead to a reduction in the strength of the parts﹐And it can generate a lot of thermal stress﹐Cause damage to the parts。High temperatures can also damage the lubricating film on the cylinder wall﹐Oxidize and deteriorate the lubricating oil﹐Resulting piston﹑The piston ring and cylinder liner are badly worn﹑Bite or stick。In addition﹐Too high a temperature will also reduce the density of air entering the cylinder﹐knock﹑Abnormal combustion such as premature combustion。
2015-03-26 Reading quantity 2875
introduction： INAbearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]The temperature of，Generally, the temperature outside the bearing surface can be inferred，If the oil hole is used, the temperature of the bearing outer ring can be measured directly，It is more appropriate。 usual，The temperature of the bearing starts to slow down as the bearing runs
2015-03-26 Reading quantity 1467
introduction：Chocolate milk beverage process Fresh milk（Or recovery milk）→pasteurization───┐ │ Chocolate（Or cocoa powder）→Melt and mix well──→│ ├─→45～50℃mixed→filtration→70～75℃homogeneity→120℃sterilize→cooling→filling sugar→dissolve→filtration───→│ │ additive→Melt and mix well────┘
2015-03-26 Reading quantity 2889
introduction：Cooling tower fan is the core equipment of circulating water system，Look at the management of circulating water equipment，Both from the number of devices、Maintenance workload、In terms of power consumption and so on，Cooling tower fans have a large proportion。The number of fans accounts for the total amount of equipment in the workshop57％，Maintenance hours account for the total amount60％，Electricity consumption accounts for the total amount22％。How to save energy and reduce consumption、Ensure long cycle operation of equipment with less labor，The following is a brief description of the measures： 1、Cross-flow cooling tower should control the height from the top of the packing to the lower edge of the fan suction section equal to or greater than the diameter of the fan0.2times。 2、Countercurrent cooling tower
2015-03-26 Reading quantity 2893
introduction： Using visible light(380～760Nanometer wavelength)illumination﹐An instrument that enlarges the image of tiny objects。This enlarged image can be seen with the naked eye﹑Photography or detection with photocells and other receivers。 (See color diagram 19Mid-century microscope Optical microscope with automatic camera A scanning electron microscope with a field-firing gun﹐The resolution is20A Ultrahigh voltage transmission electron microscope﹐The acceleration voltage is up to speed2000kV R.Hooks in17Mid-century system
2015-03-26 Reading quantity 2809
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